Here are a few useful tools for your R2 deployment I found you can use:
R2 Capacity Planning/Stress tool (new):
The Office Communications Server 2007 R2 Capacity Planning Toolkit provides a set of tools and documentation to simplify capacity planning for Office Communications Server 2007 R2.
Grab the x64 R2 Capacity Planning tool here. Note: it only runs on x64 platform.
R2 Planning tool:
This tool is an excellent planning aid for laying out your OCS R2 topology at a high level. You can even export this to Visio.
Grab the R2 planning tool here.
R2 Edge planning tool
You can grab download the R2 Edge Planning Tool here.
R2 Resource Kit tools:
Some new R2 resource kit tools and scripts are available. This also comes with the excellent Office Communications Server 2007 R2 Resource Kit book. You can grab the book here.
Here are a few tools highlighted:
A helpful voice route helper tool helps with configuring dialing rules
An R2 deployment validation tool is useful:
Call detail record reporter:
Grab the R2 Reskit tools here.
OCS Best Practice Analyzer tool:
You should run this tool prior to installation of R2 to determine the overall health of your OCS deployment. This is an excellent tool as it checks many OCS settings and hotfixes. My understanding is it is in the process of being updated for R2.
Grab the BPA tool here.